If you prefer to have a immutable database that is anchored to a blockchain, rather then a permissioned blockchain, I suggest looking at the Politeia toolkit. Time stamping the sum content of any data repository makes it censorship resistant.
This article is assumes that attacking a blockchain would be just the classical 51% attack scenario of bitcoin. Innovation from coins such as Decred show an evolution in blockchain technology that makes a 51% attack exceedingly more challenging to pull off.
"Apples to apples, Decred is 20x more expensive to attack than Bitcoin"
https://blog.usejournal.com/apples-to-apples-decred-is-20x-m...
Bitcoin demonstrated that is is possible to dis-intermediate the storage and transmission of value, an area that is the mainstay of the banking industry.
Ethereum allows for open experimentation, and has brought about the emergence of arbitrary tokens.
Decred has demonstrated that is it possible to dis-intermediate the process of political decision-making for a cryptocurrency.
https://blog.decred.org/2017/10/25/Politeia/ https://github.com/decred/politeia